Who knows factory cylinder heads ?

Thank you my friend. I wasn’t necessarily going to fix anything. But, maintenance is checking conditions. Regardless, I want adjustable rockers. What’s a good affordable set to be added to stock rocker arm ? If they are too expensive, I ll let it go for now. Until perhaps valve train noises increase one day.
Anyway you cut it it's a slippery slope..
My first suggestion is to let it go for now...
Your cheapest alternative is to probably find some Factory 273 adjustable rockers.. you could possibly get some for around $150. Then of course the adjusters start getting loose after years and you have to buy the $75 comp aftermarket adjusters.. then of course you have to buy the correct size pushrods and the correct kind...
Now if you have adjustable rockers why aren't you running solid lifters and getting the performance you should with a solid lifter cam? LOL now that you have this high-performance stuff why don't you have headers and a 4-barrel? LOL
Is it time to build a 408 stroker yet? LOL
Welcome to the slope, it's slippery...